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davidcyclebackIf you cast a wide enough net, you used to be able to get good deals in a Mastro Auction-- meaning buying stuff that you could resell for more. If your focus was narrow, you would be lest likely to find deals ("I'm looking only for a T206 Ty Cobb grad Very Good" would be narrow focus). I suspect it's harder to get these deals today.
These days, you'll sometimes find auction prices that are the reverse of deals. Such as a lot of 1,000 modern celebrity autographed photos at $30 per photo, when you'd be lucky to get $10 per photo reselling them on eBay.